Table 4.

Estimates and standard errors for β in transformation models under stratified case-cohort sampling scheme

CP	r	β1				β2
		Bias	Var	$\widehat{\text{Var}}$	ECP	Bias	Var	$\widehat{\text{Var}}$	ECP
0.90	0.0	−0.014	0.263	0.267	0.956	0.002	0.261	0.265	0.956
0.80		0.013	0.212	0.213	0.947	0.005	0.204	0.210	0.961
0.90	0.5	−0.011	0.264	0.265	0.954	0.005	0.262	0.267	0.961
0.80		−0.005	0.243	0.222	0.936	−0.005	0.233	0.224	0.956
0.90	1.0	0.015	0.275	0.274	0.956	0.005	0.272	0.281	0.958
0.80		−0.012	0.240	0.234	0.946	0.003	0.226	0.241	0.968

Note: Bias, Var, $\widehat{\text{Var}}$ and ECP are defined as the difference between the estimated and the true parameter values, the asymptotic variance estimated, the variance of the simulated estimated parameter values as well as the empirical coverage probability respectively.